a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)

同义词：iodine  /  iodin  /  atomic number 53

the smallest whole number or a numeral representing this number

同义词：one  /  1  /  ace  /  single  /  unity

the 9th letter of the Roman alphabet

同义词：letter i

used of a single unit or thing; not two or more

同义词：one  /  1  /  ane